Chronic diseases related to tobacco exposure are common among veterans. Persistent tobacco use after being diagnosed with these diseases decreases quality of life and survival. Yet, 30% of veterans with these conditions continue to smoke. Researchers have found that the social environment is important for smokers. In our current NCI-funded study, 70% of veterans with lung cancer identified at least one family member who smokes and 45% live with a family member that smokes. A family-supported smoking cessation intervention timed to follow a veteran's diagnosis of cancer or heart disease could be effective for helping veterans quit smoking.